51 lines
1.8 KiB
C
51 lines
1.8 KiB
C
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/* $Header: https://svn.ita.chalmers.se/repos/security/edu/course/computer_security/trunk/lab/login_linux/pwent.h 586 2013-01-19 10:32:53Z pk@CHALMERS.SE $ */
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/* pwent.h - Password entry header file */
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/* These routines write and read records from a password database,
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named "passdb" in the current directory.
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The 'mygetpwnam' routine takes as argument a username, and returns
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NULL on failure to find it in the database, or a pointer to static
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storage if found. This storage will be overwritten on the next
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call.
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The 'mysetpwent' routine takes a name, and a struct 'mypwent', and
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replaces the data pertaining to 'name' in the database with the
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supplied struct. It returns 0 on success, -1 on failure to replace
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the record.
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The database has free form records, the length of which must not
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exceed 79 characters, the fields are separated by ':', much like
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the passwd database. The fields are:
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name:uid:passwd:salt:no_of_failed_attempts:password_age respectively.
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Note the separate 'salt' field, to simplify some of non-obligatory
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assignments, it is of course entirely possible, not to use this
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field, but instead to include the salt in the password field, in
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similarity with the passwd database. */
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/* Usage: copy the files to your own working directory, and
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use; #include "pwent.h" to include it. */
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#ifndef PWENT_H
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#define PWENT_H
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/* Names of password files. */
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#define MYPWENT_FILENAME "passdb"
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#define MYPWENT_TMP_FILENAME "passdb.tmp"
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typedef struct {
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char *pwname; /* Username */
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int uid; /* User id */
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char *passwd; /* Password */
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char *passwd_salt; /* Make dictionary attack harder */
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int pwfailed; /* No. of failed attempts */
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int pwage; /* Age of password in no of logins */
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} mypwent;
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mypwent *mygetpwnam(char *name); /* Find entry matching username */
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int mysetpwent(char *name, mypwent *pw); /* Set entry based on uid */
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#endif
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